Ruangtrakoon, Natthawut

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Ruangtrakoon, Natthawut
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Email
natthawut.ru@kmitl.ac.th

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    Item type:Publication,
    Experimental investigation of small radial-flow expander in micro-scale organic rankine cycle powered by low temperature heat source
    (2025-07-01)
    Thongtip, Tongchana
    ;
    Singmai, Wichean
    ;
    Jamsawang, Suparat
    ;
    Ruangtrakoon, Natthawut
    ;
    Sutthivirode, Kittiwoot
    The in-house development of a radial-flow expander is proposed which aims to investigate the performance under various working conditions. The radial-flow expander is installed into a micro-scale Organic Rankine Cycle (ORC) test bench. An experimental investigation is also proposed in an attempt to discuss the operating characteristics and the system performance. The mathematical model for designing the expander is proposed and the validations of the designed performance parameters with the tested parameters is also implemented to ensure that the radial-flow expander is developed correctly. The operating characteristics of the vapour-generator with variations in the working fluid flow rate which reflects the best heat transfer performance is also a main focus. This is significant for producing the thermodynamic state of the vapour at the outlet of the vapour-generator. The overall heat transfer coefficient (U<inf>ref</inf>) based on the flow boiling at the vapour-generator is determined. The maximum shaft power and maximum thermal efficiency are determined under various working conditions. This paper also provides evidence of the ORC system operating with a low temperature heat source (range 80–90 °C). The thermal efficiency is as high as 2.5–3.5 % depending on the the working conditions. The overall heat transfer coefficient for the flow boiling at the vapour generator is 280 to 700 W/m<sup>2</sup>.K.
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    Item type:Publication,
    Real air-conditioning performance of ejector refrigerator based air-conditioner powered by low temperature heat source
    (2021-02-01)
    Thongtip, Tongchana
    ;
    Ruangtrakoon, Natthawut
    In this present work, the air-conditioning test performance of an ejector refrigerator-based air-conditioner (ERAC) was proposed. The ERAC was operated as the water chiller to produce the cooling load up to 4.5 kW. The chilled water temperature was later supplied to the fan-coil unit for producing the thermal comfort condition. The cooling water used to cool the condenser was achieved from the cooling tower which was operated under the hot and humid ambient. This is to demonstrate the feasibility of using the ERAC in real working conditions. The cooling load supplied to the air-conditioned space was applied by the air heater. The ERAC could efficiently be operated to produce the thermal comfort condition which was driven by the hot water temperature (T<inf>hot</inf> ) of 90–98<sup>◦</sup> C. The system performance could vary with the heat source temperatures, cooling load, primary nozzle, and air-conditioned space temperature. The optimal performance was determined when varying the T<inf>hot</inf>, and, hence, the optimal T<inf>hot</inf> was indicated. The optimal T<inf>hot</inf> varied significantly with variations in the working condition. The test results demonstrated high potential to further using the ejector refrigeration system in the actual air conditioning application.